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Glossary of Terms
Chapter 4 57
decisions that control the authentication,
authorization, and accounting process for a user's
access request.
PPP
See Point-to-Point Protocol.
Protocol
A set of rules established between two devices to allow
communications to occur.
Proxy
The mechanism that allows one system to mediate
between two other systems in response to protocol
requests. A RADIUS server can act as a proxy client
and forward an Access-Request to another AAA server
for authentication. As a proxy client, the server would
mediate the requests and replies between the client
where the Access-Request originated from and the
server that the request was forwarded to.
RADIUS
See Remote Access Dial In User Service.
RADIUS Client
A NAS or other device that sends requests to an AAA
server.
RAS
See Remote Access Server.
Realm
A realm is a logical group of users, who usually can be
authenticated using one particular method. Grouping
users into realms simplifies the management of those
users in a distributed environment. For example, an
ISP’s users may be from different organizations located
in different cities. Each organization already has one
way or another to authenticate its users and each
corresponds to a realm. Each realm would be
responsible for managing its users, providing
authentication and authorization for their access